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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26.07.2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Key result
Percentile:
D50
Mean:
159 µm
Remarks on result:
other: no SD indicated
Key result
Percentile:
D10
Mean:
42 µm
Remarks on result:
other: no SD indicated
Key result
Percentile:
D90
Mean:
356 µm
Remarks on result:
other: no SD indicated

The test item consisted of transparent crystalline particles.


The particles were introduced to the analyser beam by the dry powder feeder by direct spraying through the measurement area. The powder was loosened by an integrated vibrator. The particles were dispersed and fed to the optical system by pressurized dry air (1.5 bar). After passing the analyser beam the sample was collected in a vacuum cleaner.


After adjusting the laser, measuring the background and adjusting the correct particle concentration (obscuration) the measurement was started. The control software automatically performed three measurements. The average of these three measurements was given as result. Two test series of three measurements each were performed. The measurement time was 8 s.


For each test series fractions (left axis of the ordinate) and the siftings (right axis of the ordinate) are presented in percent by volume as a function of the particle size. Median values were calculated from unrounded values.


 


The median particle size L50 (D (v, 0.5): 50 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L50 = 158.2 μm


2nd test series: L50 = 159.4 μm


The average of the median particle size L50 was: L50 = 158.8 μm


 


The particle size L10 (D (v, 0.1): 10 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L10 = 42.0 μm


2nd test series: L10 = 42.8 μm


The average of the particle size L10 was: L10 = 42.4 μm


 


The particle size L90 (D (v, 0.9): 90 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L90 = 355.8 μm


2nd test series: L90 = 357.5 μm


The average of the particle size L90 was: L90 = 356.6 μm


 


The particle size distribution showed a monomodal distribution. The maximum was observed at approximately 200 μm. Additionally, a shoulder was observed at approximately 10 μm.


 

Conclusions:
The median particle size L50 of the test item deduced from the particle size distributions was 159 μm.
Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110. The median particle size L50 of the test item deduced from the particle size distributions was 159 µm.

Description of key information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110. The median particle size L50 of the test item deduced from the particle size distributions was 159 µm.

Additional information